Ivorian

The Ivorian Substage is the upper division of the Tournaisian. Its base, emended in this paper, corresponds to the first appearance of the conodont Polygnathus communis carina in the Yvoir railway station section. Its top is defined by the base of the Moliniacian Substage which corresponds now to the base of the Viséan. The Ivorian is characterized by a rich and diversified conodont fauna throughout and by a diversification of the foraminifers in its upper part. It is therefore very well zoned and precisely correlated across the Franco-Belgian Basin and beyond. Its upper boundary is marked by... Mehr ...